Video Aspect Ratio Resizer — Crop for Shorts & TikTok

About Video Aspect Ratio Resizer

Resize horizontal videos to vertical 9:16 format for TikTok, YouTube Shorts, and Instagram Reels — directly in your browser. No software installation needed.

Choose from blur background, black bars, white bars, or custom colour. Achieve a professional look without video editing experience.

All processing uses the Canvas API and MediaRecorder. Your video never leaves your device. Completely private and free.

Video dimensions for every platform in 2026

Each social platform favors specific recording dimensions:

• TikTok:1080x1920 (9:16). Full-screen vertical required for the For You feed.
• YouTube Shorts:1080x1920 (9:16). Shorts that fill the screen perform better in the Shorts shelf.
• Instagram Reels:1080x1920 (9:16). Also accepts 16:9 and 1:1, but these get reduced reach in Reels.
• Instagram Feed:1080x1080 (1:1) or 1080x1350 (4:5). Square takes less space; 4:5 gives more screen presence.
• YouTube standard:1920x1080 (16:9). Standard for all long-form content.
• Twitter / X footage:Min 1280x720. Supports 16:9, 1:1, and 4:5.
• Facebook Feed:1080x1080 (1:1) or 1280x720 (16:9). Square takes more mobile feed space.

Select the target platform preset above. resizer sets correct dimensions automatically.

Why blur background looks better than black bars

Resizing horizontal recording to vertical creates empty space on the sides. Blur fill fills this with a softened version of your video. Looks like a deliberate design choice, not a technical limitation.

Black bars create dead space. They signal the source was not made for the viewer’s device. Blur fills the screen with motion and color from the original content.

TikTok and YouTube Shorts algorithms favour videos that fill the entire screen. Higher screen coverage correlates with better completion rates — the primary ranking signal for short-form platforms.

Supported clip Formats for Aspect Ratio Resizing

Supports MP4, WebM, and MOV up to 200MB. Processes using Canvas API and MediaRecorder.

Output: WebM with VP8/VP9 footage codec and Opus audio. Convertible to MP4 via free tools.

Input: MP4, WebM, MOV (up to 200MB). Output: WebM (VP8/VP9 + Opus).

Common Aspect Ratio Resizer Use Cases

Common uses for the aspect ratio resizer:

Converting Horizontal Videos to TikTok and Shorts Format

Convert 16:9 landscape videos to 9:16 for TikTok and Shorts. Blur backdrop fills empty space professionally.

Instagram Feed Post Preparation

Repurpose clip content for Instagram feed using 1:1 square or 4:5 portrait presets. Preview shows exact crop.

Multi-Platform Content Repurposing

Create one landscape footage, generate versions for every platform — 9:16 for Shorts, 1:1 for Instagram, 16:9 for YouTube.

Adding Blur Background for Professional Look

Fill vertical dead space with blurred recording fill. Looks more polished than black or white bars.

Quick Preview Before Full Editing

Preview how footage looks in different aspect ratios before committing to a full editing workflow.

Social Media Manager Batch Processing

Adapt a single footage for different clients’ preferred platforms. Presets switch aspect ratios without re-entering settings.